Threads post previewer
A Threads post previewer renders your post the way the Threads app does: the username line, your text, the media carousel, and the like and reply row underneath. It also counts the limit the way Threads counts it, which is in bytes rather than characters.
Select accounts to see live preview
The 500 limit is measured in bytes
Threads allows 500, but it counts UTF-8 bytes rather than what you would call characters. A plain letter is one byte. An emoji is usually four. So twenty emoji cost eighty of your five hundred, and an accented or non-Latin alphabet costs two per letter.
You feel this most in a post that looked comfortably short and then would not send. The previewer counts the same way Threads does, so the number in front of you is the real one.
Media, links and the shape of the card
One attachment keeps its own aspect ratio. Several become a carousel you drag sideways, up to 20 items. The card is narrower than X’s, so text wraps sooner, and a long display name plus a long handle can push the header onto its own line.
Threads builds a link preview from the first URL in the post, so if the link is the point, put it first. Hashtags work differently here too: Threads uses one topic tag rather than a pile of them, capped at 50 characters.
Before you publish
- Budget four bytes per emoji against the 500 limit.
- Put the URL you want previewed first. Threads builds the card from the first link.
- One topic tag, not a wall of hashtags. Threads is built around a single tag per post.
- Check the wrap. The Threads card is narrower than X, so the same sentence breaks in a different place.
Preview a post for another platform
X (Twitter) post previewerAn X post previewer shows the tweet as a timeline renders it: your text at the real width, the photo grid X builds from your images, and the engagement row underneath.Open it
Instagram post previewerAn Instagram post previewer shows you the post Instagram will actually render, not the one you typed.Open it
Facebook post previewerA Facebook post previewer renders your post the way a Page timeline will: your text above the media, the album grid Facebook builds from however many photos you attached, and the Reel or Story canvas with Facebook’s own overlays on top..Open it
LinkedIn post previewerA LinkedIn post previewer renders your post as a feed will: your text with the "see more" fold in it, your image inside LinkedIn’s own canvas, and the reaction and comment row underneath.Open it
YouTube post previewerA YouTube post previewer shows the two things a viewer sees before they watch anything: the thumbnail with your title beside it, and the Short with YouTube’s interface over the top.Open it
TikTok post previewerA TikTok post previewer puts your video or your photos behind the real TikTok interface: the caption at the bottom left, the action rail down the right, the sound ticker, and the dots if you are posting a photo carousel.Open it
Bluesky post previewerA Bluesky post previewer draws your post as the app does: the display name and the domain handle, your text, the image grid, and the reply, repost and like row.Open itSocial media safe zone checkerA safe zone is the part of a full screen vertical post that the app’s own interface does not cover.Open itInstagram Reels safe zone checkerThe Instagram Reels safe zone is the part of a 1080x1920 frame that Instagram’s interface does not sit on.Open itOr preview every platform at once with the full post previewer.
This tool is free, forever. No accounts, no paywalls, no catch.
I build these solo. If you want to support my work, donating a coffee would be highly appreciated! ☕
Frequently Asked Questions
Everything you need to know about Threads post previewer from PublishQ
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— me 👋
Hi, I'm Alexandro 👋
I left my Software Engineer role at Amazon to build tools that solve real problems — the kind big companies ignore because they read spreadsheets instead of using their own products.
I was spending over an hour daily just scheduling 2 shorts across 3 platforms — logging in, reformatting, uploading one by one. That felt broken. So I built PublishQ . Now I create 4 shorts in 3 minutes and schedule them to 4 platforms in under 30 seconds.
PublishQ is bootstrapped. No investors, no vanity metrics. I build what actually helps you — because I use it every day myself.
Thank you,
Alexandro
Preview done. Now publish smarter.
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